<template>
  <div id="app">
    <div class="container">
      <!-- 顶部框模块 -->
      <div class="form-group">
        <div class="input-group">
          <h4>品牌管理</h4>
        </div>
      </div>

      <!-- 数据表格 -->
      <table class="table table-bordered table-hover mt-2">
        <thead>
          <tr>
            <th>编号</th>
            <th>资产名称</th>
            <th>价格</th>
            <th>创建时间</th>
            <th>操作</th>
          </tr>
        </thead>
        <tbody>
          <tr v-for="(itme, index) in list" :key="index">
            <td>{{ itme.id }}</td>
            <td>{{ itme.name }}</td>

            <!-- 如果价格超过100，就有red这个类 -->
            <td :class="{ red: itme.price > 100 }">
              {{ itme.price }}
            </td>
            <td>{{ formatDate(itme.time) }}</td>
            <td><a @click.prevent="cancel" href="#">删除</a></td>
          </tr>
          <tr>
            <td>统计</td>
            <td colspan="2">总价{{ totalprice }}</td>
            <td colspan="2">均价{{ avgprice }}</td>
          </tr>
        </tbody>

        <!-- <tfoot>
          <tr>
            <td colspan="5" style="text-align: center">暂无数据</td>
          </tr>
        </tfoot> -->
      </table>

      <!-- 添加资产 -->
      <form class="form-inline">
        <div class="form-group">
          <div class="input-group">
            <input
              v-model="name"
              type="text"
              class="form-control"
              placeholder="资产名称"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <div class="form-group">
          <div class="input-group">
            <input
              v-model.number="price"
              type="text"
              class="form-control"
              placeholder="价格"
            />
          </div>
        </div>
        &nbsp;&nbsp;&nbsp;&nbsp;
        <!-- 阻止表单提交 -->
        <button @click.prevent="add" class="btn btn-primary">添加资产</button>
      </form>
    </div>
  </div>
</template>

<script>
import moment from "moment";
export default {
  data() {
    return {
      name: "", // 名称
      price: 0, // 价格
      // list: [
      //   { id: 100, name: "外套", price: 199, time: new Date("2010-08-12") },
      //   { id: 101, name: "裤子", price: 34, time: new Date("2013-09-01") },
      //   { id: 102, name: "鞋", price: 25.4, time: new Date("2018-11-22") },
      //   { id: 103, name: "头发", price: 19900, time: new Date("2020-12-12") },
      // ],
      list: JSON.parse(localStorage.getItem("list") || []),
    };
  },
  methods: {
    //添加元素
    add() {
      if (this.name.length == 0 || this.price <= 0) {
        return alert("资产名称和价格不能为空或为0");
      }
      let id =
        this.list.length > 0 ? this.list[this.list.length - 1].id + 1 : 100;
      this.list.push({
        id,
        name: this.name,
        price: this.price,
        time: new Date(),
      });
      //添加完成后清空内容
      this.name = "";
      this.price = 0;
    },
    //删除
    cancel(id) {
      let v1 = this.list.findIndex((itme) => {
        itme.id == id;
      });
      this.list.splice(v1, 1);
    },
    //格式化日期
    formatDate(val) {
      return moment(val).format("YYYY-MM-DD");
    },
  },
  computed: {
    totalprice() {
      let sun = 0;
      this.list.forEach((itme) => {
        sun += itme.price;
      });
      return sun;
    },
    avgprice() {
      return (this.totalprice / this.list.length).toFixed(2);
    },
  },
  //监听  把数据存放到本地，在拉出
  watch: {
    list: {
      deep: true, //深度拷贝
      handler() {
        localStorage.setItem("list", JSON.stringify(this.list));
      },
    },
  },
};
</script>

<style >
.red {
  color: red;
}
</style>